hibernate中hql查询

package com.tudou.hibernates.t1; import java.util.List; import org.hibernate.Query; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.Transaction; import org.hibernate.cfg.Configuration; public class TestGetHql { private static Configuration cfg = new Configuration().configure(); private static SessionFactory fac = cfg.buildSessionFactory(); private static Session son = fac.openSession(); // hql普通查询 Card为类名，不是表名，可以写全路径 public static void from() { String hql = "from Card"; Query query = son.createQuery(hql); List cards = query.list(); for (Card c : cards) { System.out.println(c.getCardName()); System.out.println(c.getCreateDate()); } } // 条件查询 where public static void where() { String hql = "from Card where cardName='三国无双'"; Query query = son.createQuery(hql); List cardss = query.list(); for (Card c : cardss) { System.out.println(c.getCardName()); System.out.println(c.getCreateDate()); } } // 模糊查询 like public static void like() { String hql = "from Card where cardName like '%世%'"; Query query = son.createQuery(hql); List cards = query.list(); for (Card c : cards) { System.out.println(c.getCardName()); System.out.println(c.getCreateDate()); } } // 逻辑条件查询 > public static void gt() { String hql = "from Card c where c.createDate >'2011-08-08'"; Query query = son.createQuery(hql); List cards = query.list(); for (Card c : cards) { System.out.println(c.getCardName()); System.out.println(c.getCreateDate()); } } // 逻辑条件查询 between and 此处用了别名，省略了as关键字 public static void between() { String hql = "from Card c where c.createDate between '2011-08-08' and '2022-11-11'"; Query query = son.createQuery(hql); List cards = query.list(); for (Card c : cards) { System.out.println(c.getCardName()); System.out.println(c.getCreateDate()); } } // 逻辑多条件查询and public static void and() { String hql = "from Card c where c.createDate between '2011-01-08' and '2022-11-11' and c.cardName like '%世%'"; Query query = son.createQuery(hql); List cards = query.list(); for (Card c : cards) { System.out.println(c.getCardName()); System.out.println(c.getCreateDate()); } } // update 更新 public static void update() { String hql = "update Card as c set c.createDate='2011-03-03' where c.cardType.cardTypeId=3"; Query query = son.createQuery(hql); int num = query.executeUpdate(); System.out.println(num + "行被更新。。。"); } // delete删除 public static void delete() { String hql = "delete from Card as c where c.createDate='2011-03-04'"; Query query = son.createQuery(hql); int num = query.executeUpdate(); System.out.println(num + "行被删除。。。"); } // 单个属性查询 public static void simpleProperty() { String hql = "select c.cardName from Card as c where c.cardType.cardTypeId=1"; Query query = son.createQuery(hql); List name = query.list(); for (String s : name) { System.out.println(s); } } // 多个属性查询 其中cardTypeName直接通过card对象的cardType对象获得，省去了使用普通的sql语句必须多表连接查询的麻烦 public static void mulProperty() { String hql = "select c.cardName,c.cardType.cardTypeName,c.createDate from Card as c where c.cardType.cardTypeId=1"; Query query = son.createQuery(hql); List obj = query.list(); for (Object[] o : obj) { System.out.println(o[0] + "\t" + o[1] + "\t" + o[2]); } } // 多个属性查询 面向对象方式 public static void orientedObject() { String hql = "select new Card(c.cardName,c.createDate) from Card as c"; Query query = son.createQuery(hql); List cards = query.list(); for (Card c : cards) { System.out.println(c.getCardName() + "\t" + c.getCreateDate()); } } // 函数查询 public static void function() { String hql = "select count(*),max(c.createDate) from Card as c"; Query query = son.createQuery(hql); List oo = query.list(); for (Object[] o : oo) { System.out.println("总记录数：" + o[0] + "\t最新日期为：" + o[1]); } } // 排序 public static void orderBy() { String hql = "from Card as c order by c.createDate desc"; Query query = son.createQuery(hql); List cards = query.list(); for (Card c : cards) { System.out.println(c.getCardName() + "\t" + c.getCreateDate()); } } // 分组 public static void groupBy() { String hql = "from Card as c group by c.cardType.cardTypeId"; Query query = son.createQuery(hql); List cards = query.list(); for (Card c : cards) { System.out.println(c.getCardName() + "\t" + c.getCreateDate()); } } // 单个对象查询 呵呵，奇怪吧，对象可以查询出来 public static void simpleObject() { String hql = "select c.cardType from Card as c"; Query query = son.createQuery(hql); query.setMaxResults(1);// 必须在查询之前指定，使其返回单个对象 CardType cardType1 = (CardType) query.uniqueResult(); System.out.println(cardType1.getCardTypeName() + "\t" + cardType1.getCreateDate()); } // 按照命令行参数 格式为： :参数名 public static void parameter() { String hql = "select c.cardType from Card as c where c.cardType.cardTypeId=:id"; Query query = son.createQuery(hql); query.setParameter("id", 1); query.setMaxResults(1);// 必须在查询之前指定，使其返回单个对象 CardType cardType = (CardType) query.uniqueResult(); System.out.println(cardType.getCardTypeName() + "\t" + cardType.getCreateDate()); } // 按照参数位置 从0开始 public static void parameterPosition() { String hql = "select c.cardType from Card as c where c.cardType.cardTypeId=?"; Query query = son.createQuery(hql); query.setParameter(0, 1); query.setMaxResults(1);// 必须在查询之前指定，使其返回单个对象 CardType cardType = (CardType) query.uniqueResult(); System.out.println(cardType.getCardTypeName() + "\t" + cardType.getCreateDate()); } // 多个参数 public static void mulParameter() { String hql = "from Card as c where c.cardType.cardTypeId in (3,2)"; Query query = son.createQuery(hql); // query.setParameterList("id", new Object[]{1,2}); List cards = query.list(); for (Card o : cards) { System.out.println(o.getCardName()); } } // inner join 查询结果为多个对象的集合 public static void innerJoin() { String hql = "from Card as c inner join c.cardType"; Query query = son.createQuery(hql); List cards = query.list(); for (Object[] o : cards) { System.out.println(((Card) o[0]).getCardName() + "\t" + ((CardType) o[1]).getCreateDate()); } } // leftJoin 查询结果为多个对象的集合 public static void leftJoin() { String hql = "from CardType as c left join c.cards"; Query query = son.createQuery(hql); List cards = query.list(); for (Object[] o : cards) { // 由于保存卡片时在多的一方card进行操作，使用了级联。但手动插入的cardType可能没有相应的卡片 if (o[1] != null) {// 当卡片不为空时 System.out.println(((CardType) o[0]).getCardTypeName() + "\t" + ((Card) o[1]).getCardName()); } else { System.out.println(((CardType) o[0]).getCardTypeName() + "\t没有相应的卡片"); } } } // rightJoin 查询结果为多个对象的集合 public static void rightJoin() { String hql = "from CardType as c right join c.cards"; Query query = son.createQuery(hql); List cards = query.list(); // 插入时保证了每张卡片的类型，所以此处不用判断卡片类型是否为空 for (Object[] o : cards) { System.out.println(((CardType) o[0]).getCardTypeName() + "\t" + ((Card) o[1]).getCardName()); } } // 使用子查询 public static void childSelect() { String hql = "from CardType as c where (select count(*) from c.cards)>0"; Query query = son.createQuery(hql); List cards = query.list(); for (CardType c : cards) { System.out.println(c.getCardTypeName() + "\t" + c.getCreateDate()); } } // 程序入口 public static void main(String[] args) { // 测试方法 Transaction tr = son.beginTransaction(); // update(); mulParameter(); tr.commit(); son.close(); fac.close(); } }